Where to hook up electric temp gauge and what is this green plug???

[kpc_0721]

Ok so I could never figure out why my tach and stock temp gauge were never working until a couple weeks ago so I bought a autometer electric water temp gauge. There are to sensors on the front of the intake manifold and I cut into the one on the left where the actual sensor is hooked up and it worked perfectly fine. I was going to put my glovebox back on because I had taked it off to see if I could pull the heater core from there but anyways when I was down there I noticed that I had a big green plug that looked like it was coming out by the ecu so I plugged that in and my tach and stock temp gauge started working or so I thought....after I plugged that in my stock gauge went up about halfway right away and my aftermarket gauge shot all the way past max like they are interfering with eachother?!? Does anyone know what would be causing the gauges to do this? And also when the big green plug is not plugged in my aftermarket temp gauge works fine but my tach and stock temp gauge dont work at all. Sorry for such a long post but thought u guys needed to konw all the details....Any help at all would be greatly appreciated and also does anyone know what that big green plug is???

[WWJD]

sence you fixed what was messed up take out the after market gauge. if not double check. triple check and check your wiren' agian. just to be sure. sounds like wires could be wrong

[kpc_0721]

dont really wanna take the aftermarket gauge cuz the stock one is pretty crappy and the autometer works great....plus that would be a waste of $50 if I pulled it off? I think im just gonna try and rewire everything again and see what happens with it

[WWJD]

good move. stock gaue aint acurate nether